I'm almost positive a four speed was standard in 68/69 bees and runners. Not sure about 70s, but i think they were 4 sp too. I test-drove a 71 runner, new, with a 3sp. Lowered hp stock, so....3speed. The 3sp also avoided the insurance musclecar surcharge.
The 62/63 Maxie sticks were all three speeds. T10s were barely stout enough for a 383, so no 4speeds till the Mopar 833. (By 1964 Ford was looking to replace the T10 from behind 260s/289s, to avoid warrantee problems)